Commit a5040a90 authored by Nir Dotan's avatar Nir Dotan Committed by David S. Miller
Browse files

mlxsw: spectrum_router: Add GRE tunnel support for Spectrum-2 



Spectrum-2 GRE tunnel implementation requires a specific underlay RIF that
points to the virtual router used for forwarding the encapsulated packet.

Add Spectrum-2 specific loopback router interface creation methods which
may create or reuse the dedicated underlay RIF.

Signed-off-by: default avatarNir Dotan <nird@mellanox.com>
Reviewed-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 311596f5

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

+130 −0
Original line number Diff line number Diff line
@@ -441,6 +441,8 @@ struct mlxsw_sp_vr { 
	struct mlxsw_sp_fib *fib4;

	struct mlxsw_sp_fib *fib6;

	struct mlxsw_sp_mr_table *mr_table[MLXSW_SP_L3_PROTO_MAX];

	struct mlxsw_sp_rif *ul_rif;

	refcount_t ul_rif_refcnt;

};



static const struct rhashtable_params mlxsw_sp_fib_ht_params;
@@ -7493,14 +7495,142 @@ const struct mlxsw_sp_rif_ops *mlxsw_sp1_rif_ops_arr[] = { 
	[MLXSW_SP_RIF_TYPE_IPIP_LB]	= &mlxsw_sp1_rif_ipip_lb_ops,

};



static int

mlxsw_sp_rif_ipip_lb_ul_rif_op(struct mlxsw_sp_rif *ul_rif, bool enable)

{

	struct mlxsw_sp *mlxsw_sp = ul_rif->mlxsw_sp;

	char ritr_pl[MLXSW_REG_RITR_LEN];



	mlxsw_reg_ritr_pack(ritr_pl, enable, MLXSW_REG_RITR_LOOPBACK_IF,

			    ul_rif->rif_index, ul_rif->vr_id, IP_MAX_MTU);

	mlxsw_reg_ritr_loopback_protocol_set(ritr_pl,

					     MLXSW_REG_RITR_LOOPBACK_GENERIC);



	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ritr), ritr_pl);

}



static struct mlxsw_sp_rif *

mlxsw_sp_ul_rif_create(struct mlxsw_sp *mlxsw_sp, struct mlxsw_sp_vr *vr,

		       struct netlink_ext_ack *extack)

{

	struct mlxsw_sp_rif *ul_rif;

	u16 rif_index;

	int err;



	err = mlxsw_sp_rif_index_alloc(mlxsw_sp, &rif_index);

	if (err) {

		NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported router interfaces");

		return ERR_PTR(err);

	}



	ul_rif = mlxsw_sp_rif_alloc(sizeof(*ul_rif), rif_index, vr->id, NULL);

	if (!ul_rif)

		return ERR_PTR(-ENOMEM);



	mlxsw_sp->router->rifs[rif_index] = ul_rif;

	ul_rif->mlxsw_sp = mlxsw_sp;

	err = mlxsw_sp_rif_ipip_lb_ul_rif_op(ul_rif, true);

	if (err)

		goto ul_rif_op_err;



	return ul_rif;



ul_rif_op_err:

	mlxsw_sp->router->rifs[rif_index] = NULL;

	kfree(ul_rif);

	return ERR_PTR(err);

}



static void mlxsw_sp_ul_rif_destroy(struct mlxsw_sp_rif *ul_rif)

{

	struct mlxsw_sp *mlxsw_sp = ul_rif->mlxsw_sp;



	mlxsw_sp_rif_ipip_lb_ul_rif_op(ul_rif, false);

	mlxsw_sp->router->rifs[ul_rif->rif_index] = NULL;

	kfree(ul_rif);

}



static struct mlxsw_sp_rif *

mlxsw_sp_ul_rif_get(struct mlxsw_sp *mlxsw_sp, u32 tb_id,

		    struct netlink_ext_ack *extack)

{

	struct mlxsw_sp_vr *vr;

	int err;



	vr = mlxsw_sp_vr_get(mlxsw_sp, tb_id, extack);

	if (IS_ERR(vr))

		return ERR_CAST(vr);



	if (refcount_inc_not_zero(&vr->ul_rif_refcnt))

		return vr->ul_rif;



	vr->ul_rif = mlxsw_sp_ul_rif_create(mlxsw_sp, vr, extack);

	if (IS_ERR(vr->ul_rif)) {

		err = PTR_ERR(vr->ul_rif);

		goto err_ul_rif_create;

	}



	vr->rif_count++;

	refcount_set(&vr->ul_rif_refcnt, 1);



	return vr->ul_rif;



err_ul_rif_create:

	mlxsw_sp_vr_put(mlxsw_sp, vr);

	return ERR_PTR(err);

}



static void mlxsw_sp_ul_rif_put(struct mlxsw_sp_rif *ul_rif)

{

	struct mlxsw_sp *mlxsw_sp = ul_rif->mlxsw_sp;

	struct mlxsw_sp_vr *vr;



	vr = &mlxsw_sp->router->vrs[ul_rif->vr_id];



	if (!refcount_dec_and_test(&vr->ul_rif_refcnt))

		return;



	vr->rif_count--;

	mlxsw_sp_ul_rif_destroy(ul_rif);

	mlxsw_sp_vr_put(mlxsw_sp, vr);

}



static int

mlxsw_sp2_rif_ipip_lb_configure(struct mlxsw_sp_rif *rif)

{

	struct mlxsw_sp_rif_ipip_lb *lb_rif = mlxsw_sp_rif_ipip_lb_rif(rif);

	u32 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(rif->dev);

	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;

	struct mlxsw_sp_rif *ul_rif;

	int err;



	ul_rif = mlxsw_sp_ul_rif_get(mlxsw_sp, ul_tb_id, NULL);

	if (IS_ERR(ul_rif))

		return PTR_ERR(ul_rif);



	err = mlxsw_sp_rif_ipip_lb_op(lb_rif, 0, ul_rif->rif_index, true);

	if (err)

		goto err_loopback_op;



	lb_rif->ul_vr_id = 0;

	lb_rif->ul_rif_id = ul_rif->rif_index;



	return 0;



err_loopback_op:

	mlxsw_sp_ul_rif_put(ul_rif);

	return err;

}



static void mlxsw_sp2_rif_ipip_lb_deconfigure(struct mlxsw_sp_rif *rif)

{

	struct mlxsw_sp_rif_ipip_lb *lb_rif = mlxsw_sp_rif_ipip_lb_rif(rif);

	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;

	struct mlxsw_sp_rif *ul_rif;



	ul_rif = mlxsw_sp_rif_by_index(mlxsw_sp, lb_rif->ul_rif_id);

	mlxsw_sp_rif_ipip_lb_op(lb_rif, 0, lb_rif->ul_rif_id, false);

	mlxsw_sp_ul_rif_put(ul_rif);

}



static const struct mlxsw_sp_rif_ops mlxsw_sp2_rif_ipip_lb_ops = {

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